S-93548A544 1/4"-20 x 1 1/4" ASTM A307, SAE J429, ASME B18.5 Carriage Bolts
Carriage Bolts
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Basic Information
Head Parameters
Neck & Shank Parameters
Dimension Parameters
Thread Parameters
Material & Strength Parameters
Finish & Compliance Parameters
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Key Features & Benefits at a Glance
- Anti-rotation square neck design prevents spinning during installation, ensuring secure fastening in wood and metal assemblies
- Grade 2 strength rating with 60,000 PSI tensile strength provides reliable performance for medium-duty industrial and construction applications
- Zinc-plated steel construction offers corrosion resistance for extended service life in various environments
- Fully threaded UNC coarse threading delivers superior grip and faster installation in multiple materials
- Wide rounded head profile distributes clamping force effectively while providing an attractive finished appearance
- Rockwell B70 hardness ensures durability and resistance to deformation under load
- Comprehensive standards compliance guarantees consistent quality and engineering reliability
Professional Applications & Engineering Value
These Grade 2 carriage bolts with square neck design solve critical fastening challenges in wood-to-metal connections and structural assemblies where rotation prevention is essential. The zinc-plated steel construction provides corrosion protection for outdoor equipment, agricultural machinery, and construction frameworks. The fully threaded UNC coarse threading ensures rapid installation in timber, structural steel, and industrial equipment while maintaining 60,000 PSI tensile strength. The combination of Rockwell B70 hardness and rounded head profile makes these fasteners ideal for applications requiring both structural integrity and finished appearance, from building construction to machinery assembly.
Specification Summary & Compliance
Manufactured to precise Class 2A thread fit tolerances with 1/4"-20 UNC coarse threading in right-hand direction. These carriage bolts comply with ASTM A307, SAE J429, and ASME B18.5 specifications for dimensional accuracy and performance requirements. The product is RoHS 3 (2015/863/EU) Compliant for environmental safety, featuring a square neck measuring 0.26" width and 0.16" length with a 0.594" diameter rounded head.
